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Check all of the reasons that you included in your answer. Copper oxide is the only product, and it contains copper and oxygen. One of the reactants is copper, so the other reactant must be oxygen. The copper metal must have combined with something in the air.

User Weenoid
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Answer:

check all of them

Step-by-step explanation:

User Toru
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Answer:

that something in the air is oxygen

User Dufei
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